mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-10-01 05:35:54 +00:00
79 lines
2.2 KiB
Diff
79 lines
2.2 KiB
Diff
diff --git a/drivers/uio/msm_sharedmem/sharedmem_qmi.c b/drivers/uio/msm_sharedmem/sharedmem_qmi.c
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index bb6a23b..c8ecd5d 100644
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--- a/drivers/uio/msm_sharedmem/sharedmem_qmi.c
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+++ b/drivers/uio/msm_sharedmem/sharedmem_qmi.c
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@@ -1,4 +1,4 @@
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-/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
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+/* Copyright (c) 2014-2015, 2017, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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@@ -257,12 +257,17 @@
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#define DEBUG_BUF_SIZE (2048)
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static char *debug_buffer;
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static u32 debug_data_size;
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+static struct mutex dbg_buf_lock; /* mutex for debug_buffer */
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static ssize_t debug_read(struct file *file, char __user *buf,
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size_t count, loff_t *file_pos)
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{
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- return simple_read_from_buffer(buf, count, file_pos, debug_buffer,
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- debug_data_size);
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+ size_t ret;
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+ mutex_lock(&dbg_buf_lock);
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+ ret = simple_read_from_buffer(buf, count, file_pos,
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+ debug_buffer, debug_data_size);
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+ mutex_unlock(&dbg_buf_lock);
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+ return ret;
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}
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static u32 fill_debug_info(char *buffer, u32 buffer_size)
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@@ -313,21 +318,29 @@
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{
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u32 buffer_size;
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- if (debug_buffer != NULL)
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+ mutex_lock(&dbg_buf_lock);
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+ if (debug_buffer != NULL) {
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+ mutex_unlock(&dbg_buf_lock);
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return -EBUSY;
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+ }
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buffer_size = DEBUG_BUF_SIZE;
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debug_buffer = kzalloc(buffer_size, GFP_KERNEL);
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- if (debug_buffer == NULL)
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+ if (debug_buffer == NULL) {
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+ mutex_unlock(&dbg_buf_lock);
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return -ENOMEM;
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+ }
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debug_data_size = fill_debug_info(debug_buffer, buffer_size);
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+ mutex_unlock(&dbg_buf_lock);
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return 0;
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}
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static int debug_close(struct inode *inode, struct file *file)
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{
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+ mutex_lock(&dbg_buf_lock);
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kfree(debug_buffer);
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debug_buffer = NULL;
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debug_data_size = 0;
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+ mutex_unlock(&dbg_buf_lock);
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return 0;
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}
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@@ -358,6 +371,7 @@
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{
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struct dentry *f_ent;
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+ mutex_init(&dbg_buf_lock);
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dir_ent = debugfs_create_dir("rmt_storage", NULL);
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if (IS_ERR(dir_ent)) {
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pr_err("Failed to create debug_fs directory\n");
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@@ -386,6 +400,7 @@
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static void debugfs_exit(void)
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{
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debugfs_remove_recursive(dir_ent);
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+ mutex_destroy(&dbg_buf_lock);
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}
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static void sharedmem_qmi_svc_recv_msg(struct work_struct *work)
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